Attrition-mill.



J'. S. SORBNSEN.

ATTRITION MILL.

, 914. 1, 1 1 1,274 IPatented Sept. 22, 1914.

` 2 SHEETS SHEET 2.

1UNITED STATES PATENT OFFICE.

JOHN S. SORENSEN, 0F MUNCY, PENNSYLVANIA, ASSIGNOR T0 SPROUT, WALDRONl & COMPANY, 0F MU'NCY, PENNSYLVANIA, A CORPORATIKON 0F PENNSYLVANIA.

ATTRITION-MILL Specification of Letters Patent.

Original application led April 7, 1911, Serial No. 619,621. Divided and'this application led July 1, 1914.

serial No. 848,344.

To all whom it may concern.'

Be it known that I, JOHN S. SoRENsEN, a citizen of the United States, residing at Muncy, in the county of Lycoming and State of Pennsylvania, have invented certain new and useful Improvements in Attrition-Mills; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

This invention relates to kattrition mills; this application being a division of my application, filed April 7, 1911, Serial No. 619,621.

The objects of the present invention are to provide simple, inexpensive and eilicient means whereby the runner-shafts will be supported positively and ixedly in axial alinement and the runners maintained With their working faces or grinding plates in parallel relation so as to avoid the necessity for tramming, which is necessary inattrition mills as heretofore-constructed; the only adjustment required after the mill has been set up in operative position being a longitudinal movement of the runner-shafts to take up or compensate for wear upon the grinding plates and the sealing rings. y

In the accompanying drawings, Figure 1 represents a vertical longitudinal sectional view of an attrition mill embodying my invention; Fig. 2 is an end elevation; Fig. 3 is a perspective view of the base; and Fig;

4 is a detail sectional view taken on the line.

3 3 of Fig. 3.

Referring to said drawings, in Whichpthe same reference characters or numbers are used to vdenote corresponding parts in different views, 1 denotes the base, which may be of any desired size. It is preferably in the form ofA a parallelogram, and provided along its longitudinal side edges with sock ets or brackets 2, through which fastening bolts may be inserted for securing it to a suitable foundation or fixed support, and has a centrally disposed spout 3, throu h which the ground material escapes to stored or subsequently treated as may be necessary or desirable, according to the nature of the product. Between eachendof the base and the spout 3 an opening 4 may 4cured thereon.

be provided through its top to reduce its weight without affecting its strength, and ribs v5 may be formed on its under side at opposite sides of said openings 4, to reinforce and strengthen the topplate and also lend additional support to the devices se- In order thatV the runnershafts may be maintained in axial alinement and the grinding surface of the runners kept in parallel relation without tramming, the base is formed or provided on its upper side with longitudinal ribs or abutments 6, the inner faces or shoulders 7 of which may rise from'the base or bosses thereon in true vertical planes. The several ribs at each side are arranged in exact longitudinal alinement, and each rib or abutment preferably' rises from a boss 8 on the top of the base, which boss .has a perfctly smooth upper face or surface arranged in a truehorizontal plane, whereby a series of alined seats are provided for runner-shaft supports, said seats having alined marginal ribs or abutments between which said supports are confined. Mounted on said seats between and closely engaging said abutments are runner-shaftl supports or pedestals 9. The runner shafts 11 and 12 are each journaled in a plurality of Isaid supports and'each shaft carries a runner 13 having its grinding surface arranged to coact with the grinding surface of the adjacent runner. Through the bosses 8 and the base are vertically disposed internally threaded openings adapted to receive tap bolts inserted through the lower ends of the pedestals or .runner-shaft supports to secure the same in position. In the form shown the pedestals have their lower corners planed so as to present angular surfaces which are adapted to fit snugly upon the upper faces of the bosses 8 and against the inner faces of the ribs or abutments 6. A number of these pedestals are provided, two being shown to support each runner-shaft, and the several pedestals-may be identical in construction, except that the tail end pedestal is preferably somewhat wider than the others, in order to afford the necessary support for an end thrust bearing. Upon the sides of the pedestals, at the lower ends thereof, are preferably formed upstanding Patented Sept. 22, 1914.

bosses 14 through which the tap screws 15 are insertedto engage the `openings in the ,base and thereby firmly secure the pedestals in position.

In the illustrated embodiment of my invention, the outer facey or side of the lower corner of the pedestal is disposed at a true right angle to the under face of the same and in ag true vertical plane, in order that the several pedestals may be fitted upon' the bosses of the base and between the ribs thereon with "such nicety and accuracy that subsequent adjustment of the same will be rendered entirely unnecessary. The fastening screws may therefore be turned home, so 'as to rigidly secure the pedestals infposition without' the-use of any lock-nuts, and

when .the pedestalsar'e once secured in place,

they willremain. fixed durin the life of the machine. The bosses upon t e base provide seats raised slightly abovothe plane of the 1 top of the base while the under sides or lower ends of the pedestals are recessed between their extremities, as shown at 16, so

` that the contacting surfaces will be reduced to the smallest possible area and possible wear due to any unforeseen vibration of the machine will be obviated.

The upper ends of the pedestals are adapted to receive and support bearings for the runner shaft supports. As shown', a bearing shell of substantially the form of .a sleeve is provided, the length of which may correspond to the width of the seat therefor on the upper end of the pedestal, and the shells are secured in place so that movement thereof upon the pedestals will be prevented and consequently the necessity for adjustment of the bearings will be overcome. As the bearing shells cannot'move relatively to the pedestals and the pedestals cannot move relatively tothebase, wear upon these parts is prevented and when once assembled they will remain fixed in place for all time. The bearing shellgfor the end bearing 17 is interiorly threaded. throughout its length, and is open at both ends, and has a box 18 screwed therein within which is secured an anti-friction bearing in which the-end of the head runner shaft'lll is mounted, while the bearing shells for the intermediate bearings on opposite sides of the housing for the grinding heads have smooth bores in which are slidably vfitted anti-friction bearings for the runner-shafts. The inner bearing 19 for the head runner-shaft 11 is a duplicate of the inner bearing 20 foi` the tail runner-shaft 12, except that the cover is at the opposite side of the center of the-mill. Said shells 19 and 20 have their inner ends adjacent the casing for the runner heads partly closed by internal ribs or flanges. The outer end of the runner-shaft 12 is mounted in an anti-frictiony bearing slidably fitted in a bearing shell 21 extension or neck` inclosing a spring and associated parts-arranged to urge the shaft inwardly while a weaker spring interposed between' a cover plate on the inner end of abutments for conning such supports therebetween, a plurality of runner-shaft-supports mounted. on said 4seats between and closelyengaging said abutments, and run-' ner-shafts each'journaled in a plurality of said supports and yeach carrying a runner having :its grinding surface arranged to co- 1act with the grinding surface of the adjacent runner in grinding, whereby said shafts are maintained in axial alinement andthe grinding surfaces of said runners kept in parallel relation without tramming.

2. A non-trammable attrition mill comprising a base having a series of alined seats thereon for runner-shaft supports, a series of supports fitting in said seats, alined shafts journaled inbearings on said supports each carrying a runner at one end arranged in cooperative relation to a 'runner on the adjacent end of the .other shaft, and means for securing said supportsfixedly in their seats with provision for longitudinal adjustment thereof, whereby said shafts are positively and ixedly maintained in axial alinement and the grinding surfaces of -said runners kept in parallel relation without tramming.

3. A base for attrition mills provided at each side thereof with a series of alined bosses on its top adapted to support in axial -alinement a plurality of runner-Shaft-supports and upstanding shoulders at'the outer edges of said bosses arranged in alinement, said bosses and shoulders constituting angular seats for runner-shaft-supports which permit longitudinal movement4 of the supports when engaged therewith.

4. A base for attrition mills having longitudinal series of bosses on its top and shoulders at the outer edges of said bosses, the tops of the bosses being smooth and all in the same horizontal planeand the shoulders at each side of the base being arranged in alinement, whereby the bosses and shoulders constitute alined angular seats for runner-shaft supports which permit longitudinal movewith.

5. base for attrition mills having a oentral depending discharge spout and depend-l ing transverse ribs on its under side between said mouth and its ends, and provided on itsA upper side with bosses over said ribs and abutments at the outer edges off said bosses, said bosses .and abutment/s constituting alined angular seatsl for thev runnershaft supports. I

6. In an attrition mill, thecombination of a base having at each side thereof a series of alined angular seats on itsupper -side ex tending longitudinally of the base fortheir full length, 'rigid pedestals having angular loweroorners fitting closely in said seats and secured to the base, and runner-carrying shafts each supportedA on a plurality of pedestals and carrying a` runner the grinding surface of which is parallel with and arranged in operative relation to the grinding surface of the runner on the other shaft and maintained in such relation without tram-r ming.

7. A non-trammable attrition mill comprising a base having a 'series of alined seats and oppositely disposed albutments thereon, a series 'ofa lined runner-shaft sup.-

ports seated between and engaging said abutments, alined -runner-shafts journaled in bearings on said supports, there being a plurality of said supports for each Shaft,

and each shaft carrying a runner having its grinding surface arranged in coperative relation to the grinding surface ofthe runner on the other shaft, whereby. said shafts are positioned andY maintained in alinement rendering tramming unnecessary.

8. In an attrition mill, the combination.

for engaging said supports and retaining them positively in alinement with one another, whereby the necessity for tramming is avoided; said abutmen'ts extending longitudinally `of the base for their full extent, whereby the supports may be moved longitudinally on the base kwhile in engagement with the abutments.

10. A non-trammable attrition mill com prising a supporting base having a series of alined seats thereon extendlng longitudinally thereof, rigid pedestals detachably secured to said base, and having an lar lower corners fitting closely against a med shoulders extending along the outer margins of said seats, shaft bearings on said pedestals, therev being a pair of bearings for each shaft, and a shaft revolubly fitted in eac-h pair of bearings.

11. A non-trammab'le attrition mill oom- 'prising a base having at each side thereof a series of alined seats thereon, a series of alined pedestals fitting in said seats and secured to said base, andrunner-carrying shafts each revolubly supported in bearings on a plurality of said pedestals and carrying at one end a runner having its grinding surface arranged parallel with and 1n coperative relation to the grinding surface of the runner on the adjacent end of the other Shaft. v A i l2. A non-trammable attritionmill comprising a. supporting base having a series of` alined angular seats on its upper side extending longitudinally thereof, pedestals having angular bases fitting between and closely against oppositely disposed seats,

means for securing said pedestals in fixed positions, and two shafts each revolubly supported in bearings on a plurality of said pedestals, and a runner onv the end of each of said shafts having its grinding surfa arranged parallel with and in operative relation to the grinding surface of the runner on the adjacent end of thel other shaft.

13. In an attrition mill, the combination of a supporting base having a plurality of f angular'seats on itsupper side extending longitudinally thereof, rigid pedestals hav:

ing angular lower corners fitting closelyyin said seats anddetaehably secured to said base, said` pedestals having bearings 1 slidably mounted thereon, and a shaft fitted in said bearings. Y.

14. In an attrition m'ill, the combination of a supporting base having a plurality of angular seats on its upper side extending longitudinally thereof for their full length,

rigid pedestals having angular lower corners fitting closely against oppositelydisposed shoulders of said seats and secured to' said base, said -pedestals having -bearings slidably mounted thereon, a shaft tted in said bearings, and means for adjusting said 4slidably mounted bearings, whereby said shaft may be adjusted longitudinally.

15. The combination in an attrition mill having alined shafts with grinding disks thereon arranged in juxtaposition, of a supporting base, pairs of alined standards mounted on said base on opposite sides of said disks, a shaft journaled in bearings on each pair of standards, said base having seats for said standards arranged 1n aline- -ment, the vtops of said seats being smooth 'and all larranged in the same horizontal plane, and means for securing said standards to said base, whereby said shafts are positively and fxedly maintained in axial alinement 'andthe surfaces of the grinding' side of the basebeing arranged in alinement f `disks maintained in parallel relation, thereand the tops of said seats being smooth and by avoiding the necessity for tramming. all arranged in 'the same horizontal plane. is

i 16. A supporting base :forl an attrition' In testimony that I claim the foregoing 5 mill having a series of. oppositely disposed as my own, I afin; my signature in presence 1o seats thereony for supporting a series -of of two witnesses. v standards carrying runner-shafts in axial. JOHN S. SORENSEN. .alinement parallel with lsaid seats,said seats Witnesses: 1

- having shoulders for confining the stand- HELEN KENN'EUJY, 10 'ards therebetween, the shoulders at each Em F. MoKm-L 

